Obtain de-Broglie waveelngth of an electon of kinetic energy 150 eV.Given mass of electron,`m=9.1 xx 10^(-31) kg`,charge on electron, `e=1.6 xx 10^(-19) C` and Planck's constant ,`h=6.62 xx 10^(-34) J s`.

Calculate the de-Bronglie waveelngth for electron and protonif their speed is 10^5 m s^(-1) .Given,mass of an electron =9.1 xx 10^(-31) kg ,mass of proton = 1.67 xx 10^(-27) kg and Planck's constant = 6.62 xx 10^(-34) J s .

Calculate the De-Brogile wavelength of an electron and proton if their 10^5 m//s given mass of electron is 9.1 xx 10^(-31) kg (kilogram). Mass of proton 1.67 xx 10^(-27) kg . Plank.s constant h=6.625 xx 10^(-34) JS (Joule Second).

Find de-Broglie wavelength associated with an electrons moving with velocity 0.6 C. Given, rest mass of electron = 9.1 xx 10^-31 kg , h=6.63 xx 10^-34 Js .

If the free electron density of copper is 8.6xx10^(28)m^(-3) and resistivity of copper at room temperature is 1.7xx10^(-6)Omega cm , find the relaxation time for the free electrons of copper. Given, mass of electron =9.1xx10^(-31) kg , and charge of electron =1.6xx10^(-19)C. Boltzmann's constant k = 1.38 xx 10^-23 J K^-1

Calculate the de-Broglie waveelngth of an electron of energy 400 eV.Given,lanck's constant = 6.6 xx 10^(-34) J s, mass of electron = 9.1 xx 10^(31) kg,1 eV = 1.6 xx 10^(-19) J .

Find the wavelength for a beam of neutrons,whose kinetic energy is 100 eV.Given that mass of neutron = 1.676 xx 10^(-24) g and h= 6.62 xx 10^(-27) erg s. .